Suction press assembly



Jan. 1 9, 1954 BEACIIHLER I 2,666,371

SUCTIONPRESS ASSEMBLY Filed Sept. 27, 1950 a x; s:

a, %,M- u/flzk. 7 57 I 55 15 5 Patented Jan. 19, 1954 SUCTION PRESS ASSEMBLY Edward D. Beachler, Beloit, Wis., assignor to Beloit Iron Works, Bcloit, Wis., a corporation of Wisconsin Application September 27, 1950, Serial No. 187,011 2 Claims. (CI. 92-49) The present invention relates to a suction press assembly for a paper making machine and more particularly to a suction press assembly wherein a suction press roll cooperates with a dryer drum to define a suction press nip, the press roll also serving to transfer a moist paper web from a press felt to the dryer drum.

The paper making machine press section of the present invention generally includes a suction pickup roll lapped by a pickup felt for removing a moist paper web from a foraminous forming surface of a paper making machine forming part. The pickup felt is trained through the nip of a conventional suction press, at which nip the web is transferred to a press felt which is also trained through the press nip. Following passage of the web through the press nip, the web is retained upon the press felt until removed therefrom by means of a transfer felt lapped about a suction press roll which is in pressure nip-defining relation with a paper making machine dryer part, such as the Yankee dryer drum. 7 The press roll which defines the press nip with the dryer drum is provided with a pair of peripherally spaced suction areas including a first relatively high suction area which is directed through the transfer felt toward the moist paper web carried upon the press felt, this suction area effectively transfers the paper web to the transfer felt as the same is lapped about the suction area. The second suction area of this press roll is provided adjacent the press nip definedby the roll in conjunction with the dryer drum, so that an effective mechanical pressure-differential air pressure nip is provided. This second suction area of the press roll is evacuated to a relatively low degree of vacuum so that the suction area does not interfere with transferral of the moist paper web to the surface of the dryer drum.

It is, therefore, an important object of the present invention to provide an improved suction press assembly including a suction press roll defining a press nip with a dryer drum and serving to transfer a moist paper web from a press section to'a paper making machine dryer section.

Another important object of the present invention is to provide a paper making machine press assembly including a suction press through which a moist paper web is conveyed by apress felt, a Yankee dryer drum, and a suction press roll in press nip-defining relationship with the dryer drum to define a suction press nip therewith and having an additional suction area for removing the paper web from the press felt to a transfer felt lapped about the suction roll and thence to the surface of the dryer drum.

It is a further important object of the present invention to provide an improved paper making machine press assembly including a suction press having'a pickup felt trained therethrough for guilding a moist paper web through the suction press nip, a press felt also trained through the suction press nip and receiving the moist paper web thereon at the nip, a suction press roll having a first suction area effective to transfer the moist paper Web from the press felt to a transfer felt lapped thereabout and thence to a Yankee dryer drum in press nip relation with the suction press roll at another suction area of the press roll.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings.

' of the forming wire It. A suction couch roll it is provided with a conventional arcuate save-all pan It to receive Water removed from the web W by means of the roll suction area M and flung centrifugally from the roll.

The web W is removed from the wire I5 intermediate the couch roll I I and the turning roll l2 by means of a pickup felt l5 guided by a plurality of felt guide rolls it into contact with a suction pickup roll H. The suction pickup roll i? is partially surrounded by an arcuate save-all pan I8 and is provided with a pair of internal suction areas [9 and 20, respectively, the latter of which is provided with a vacuum control valve 2 l The moist paper web W is removed from the wire Ill onto the pickup felt it by a relatively high degree of vacuum within the suction area i 9 and is retained upon the pickup felt by a relatively lower degree of vacuum within the suction area 28 as regulated by the valve 2 I.

The pickup felt i5 is next trained by the guide rolls it through a suction press nip 23 defined by a plain upper press roll 24 located within the loop of the felt l5 and by a lower suction press roll 25 having an internal suction area 2% located at the press nip 23. Again, the suction roll 25 is partially surrounded by an arcuate save-all pan 27, and a press felt 28 is trained through the press nip 23 and about the suction area 26 of the suction press roll 25 by means of press felt guide rolls 29.

The moist paper Web W is transferred to the press felt 28 at the suction press nip 23 by the suction area25, and the press felt it! bearing the web W thereon is guided in a substantially horizontal plane by means of certain of the guide rolls 29.

The moist paper web carried by the press felt 28 is next contacted with a transfer felt 3| which is lapped about a portion of the periphery of a suction press roll 32 by means of transfer felt guide rolls 33. Transfer of the moist paper web W from the press felt 26 to the transfer belt 3! is accomplished by means of a relatively high vacuum suction area 3d of the suction press roll 32 which acts upon the Web N through the transfer felt 3 I.

The roll 32 is in press nip-defining relation with a superimposed Yankee dryer drum 35 (on the up-running side of the roll 32), and the suction roll 32 is provided with a second suction area 9'? located at the press nip. The degree of vacuum within the suction area 3'? is held at a relatively low value by means of a vacuum control valve 35 located within the suction area 3'4 so that a suc tion press nip may be provided by the roll 32 and the drum 35 without interfering With transfer of the moist paper web from the transfer feit to the bare exposed surface of the Yankee dryer drum 35.

The suction roll 32 is provided with a conventional save-all pan 38 and a doctor blade 39 is provided to insure removal of the dried web W from the bare surface of the dryer drum 35.

Operation of the suction press assembly ofthe present invention will be readily appreciated. The moist web W formed upon the foraminous wire II] is effectively removed therefrom by means of the pickup felt l5 lapped about the suction pickup roll !7, and the pickup felt conveys the moist paper web to the suction press nip 23. At the nip 23, the suction area 26 of the suction press roll 25 transfers the moist web to the press felt 28 for conveyance to the transfer felt 35.

The suction press roll 32 is provided with the two suction areas 34 and 3'1 respectively, performs a plurality of functions. First, the suction area 34 transfers the moist Web to the transfer felt 3|. Secondly, the roll in conjunction with the transfer felt 3i, bridges the gap between the press felt 28 and the Yankee dryer drum 35. Additionally, the roll 32 provides an additional mechanical and differential air pressure nip with the Yankee dryer drum 35 so that further drying of the web is accomplished at the nip between these two rolls. Finally, the suction area 3? serves to remove any residual moisture. squeezed from the moist web at the final press nip provided by the roll 32 and the drum 35 is removed by means of th second suction area 3'! of the roll 52.

It will he understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention.

I claim as my invention:

1. A suction press assembly for a paper making machine comprising a first suction press roll, a plain roll thereabove cooperating therewith to define a horizontal suction press nip, a looped pick up felt turned about said plain press roll for conveying a moist paper web to said press nip, a suction pick up roll also within the loop of said pick up felt for acting therethrough to pick up a moist paper web from a forming section of a paper machine, said pick up felt having a horizontal run the entire distance from said pick up suction roll to said press nip, a press felt trained through said suction press nip and lapping said first suction press roll for receiving the moist paper web at said nip, a second suction press roll, a transfer felt lapped about said second suction press roll, said second suction press roll hav- 4 ing a suction area acting through said transfer felt at the point of contact of said transfer felt with said moist paper for transferring said moist paper web to said transfer felt, said press felt having a horizontal run the entire distance from said press nip to the point of transferring said web to said transfer felt, and a Yankee dryer drum defining a press nip with said second suction press roll at a point peripherally spaced from the point of transfer of said paper web to said transfer felt and receiving said paper web from said transfer felt for travel with said dryer drum on the surface thereof, whereby the web is conveyed in a substantially horizontal plane from said suction pick-up roll to said second suction press roll.

2. In a paper machine, a press assembly for receiving a moist paper Web from a wire of paper web forming section of the paper machine and pressing the web comprising a looped transfer felt, a suction transfer roll in the loop of said felt directing the felt against the web on top of the wire for transferring the web to the under face of the transfer felt, a first press having a horizontal nip defined by an upper press roll and a lower suction press roll, said upper roll being within the transfer felt loop, said transfer felt having a substantially horizontal run the entire distance from the wire to said horizontal press nip, a bottom felt trained about said lower roll for receiving the web departing from the horizontal nip, a second press having a nip defined by a suction roll and a Yankee drier drum on the up-running side of said suction roll, a press felt looped about said suction roll of said second press and urged thereby against said bottom felt for effecting suction transfer of the web from said bottom felt to said press felt and through the second press nip, said bottom felt having a substantially horizontal run the entire distance from said horizontal nip to the point of web transfer from said bottom felt to said press felt looped about the suction roll of the second press, and suction areas in said suction roll of said second press coacting through said press felt to effect web transfer thereto and to effect water removal at said nip on the up-running side of the suction roll of said second press, whereby the web is maintained in a substantially horizontal plane during its travel from the wire through the first press and to the suction roll of the second press.

EDWARD D. BEACHLER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,163,253 Millspaugh Dec. 7, 1915 1,517,018 Scaborne Nov. 25, 1924 1,701,226 Collins 1.. Feb. 5, 1929 1,858,546 Farnsworth May 17, 1932 1,898,611 Berry et al. r Feb. 21, 1933 1,981,049 Kellett Nov. 20, 1934 2,005,929 Berry June 25, 1935 2,186,171 Millspaugh Jan. 9, 1940 2,204,426 Millspaugh June 11, 1940 2,209,757 Berry July 30, 1940 2,209,758 Berry July 30, 1940 2,209,761 Berry July 30, 1940 2,386,584 Berry Oct. 9, 1945 2,415,350 Hornbostel et al Feb. 4, 1947 FOREIGN PATENTS Number Country Date 431,408 Germany June 13, 1924 

